JP2002528697A - Cooling plate and cooling device for vertical furnace wall - Google Patents

Abstract

(57) [Summary] Prevent the coolant leaked from the liquid cooling type cooling member of the furnace from entering the inside of the furnace. The invention relates to a cooling system for cooling an essentially vertical furnace wall of a furnace. The system comprises a lower cooling device comprising a cooling plate (14) and an upper cooling device. For this purpose, the upper cooling device is gripped from below by the upper ridge (24) of the cooling plate (14), and the majority of the coolant from the leaking part of the cooling pipe is collected by one of said upper ridges (24). It is possible to discharge only to the back surface (22) of the cooling plate (14).

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a cooling plate and a cooling device for a vertical wall of a general furnace, particularly a metal furnace.

[0002] A small amount of leakage often occurs in a liquid cooling type cooling member of a furnace, but since such a leakage cannot be easily detected, the member is usually left unnoticed for a long period of time. However, such small leaks carry an undeniable safety risk, especially in metal furnaces such as arc furnaces, electric reduction furnaces, blast furnaces, blast furnaces and the like. The slow but continuous penetration of spill water from the leak into the furnace refractory lining destroys the refractory lining extensively and ruptures the furnace, causing metal spills and, in some cases, severe violence. An explosion occurs.

An object of the present invention is to reduce a safety risk caused by a leak generated in a cooling device provided on a vertical furnace wall. This task is solved by a cooling plate according to claim 1.

[0004] The cooling plate, like the well-known cooling plate in a blast furnace, has a front surface, a back surface, two lateral ends, a top region, a surface region consisting of a bottom region, and the like. When the cooling plate is assembled, the front faces the interior of the furnace and the back faces the vertical furnace wall. According to an important feature of the invention, the top end of the cooling plate is designed to deflect liquid leaking thereon exclusively towards the rear of the cooling plate.
For this purpose, the upper end of such a cooling plate has, for example, ribs projecting upwards towards the front face, the ribs flowing down to the top end and flowing out towards the front face of the cooling plate. It is designed to prevent that.

If the cooling plate is arranged on a vertical furnace wall below the upper cooling device such that the top end of such a cooling plate extends below the upper cooling device, the leakage portion of the upper cooling device Most of the cooling liquid that may leak from the cooling plate is trapped by one of these top ends and is deflected to the back of the cooling plate. This prevents a large amount of the coolant leaking from the leak portion from penetrating into the refractory material on the front surface of the cooling plate without being noticed, and accumulating inside the furnace. In addition, this is ensured by controlling the deflection of the leaking coolant from the leaking portion of the upper cooling device, which is easy to detect and locate. In a preferred embodiment, the top end of the cooling plate is designed as a collecting channel and has an outlet towards the rear of the cooling plate. Thus, liquid collected from the top end of the cooling plate is deflected through this outlet. This is preferably done through an opening in the shell plate of the furnace wall so that the leak is relatively easily detected and located. If further outlets projecting through the openings of the shell plate are assigned to the corresponding outlets of the collecting channel, the detection of leaks is further simplified. For example, a liquid detector could be assigned to such an outlet that immediately signals the occurrence of a leak above a particular cooling plate.

The collection channel at the top end preferably has a slope towards the outlet. Also seal it with a barrier at both lateral ends,
It is also possible for overflow to the side to be prevented. The cooling plate according to the invention can be used as a lower cooling device. In that case, the cooling plate is arranged on a substantially vertical furnace wall, below the upper cooling device with steel or copper cooling tubes. The cooling plate is preferably designed as a solid copper plate, ensuring cooling of the furnace wall in the lower area under heavy load and cooling of the cooling tubes in the upper area under light load. I have. The potential for leakage in the copper cooling plate is relatively low. This is because, in particular, the wall thickness is large and the copper has a high resistance to degradation under the influence of heat. Their top ends, designed according to the invention, detect small leaks in the cooling tubes and make sure that a considerable amount of liquid from such leaks penetrates unaware into the refractory material or the interior of the furnace. To prevent.

[0007] The cooling plate can also be used as another lower cooling device. In that case, it is arranged in a substantially vertical furnace wall cooling system below the upper cooling system with another cooling plate. In this case, the bottom end of the upper cooling plate is narrower than the top end of the lower cooling plate. Further, the shape of the bottom end of the upper cooling plate is preferably complementary to the shape of the top end of the lower cooling plate, such that the top end of the lower cooling plate is part of the bottom end of the upper cooling plate. It is designed to overlap. In a preferred embodiment, the bottom end of the upper cooling plate projects into a collection channel formed, for example, by the top end of the lower cooling plate. Of course, the cooling device may be one in which a plurality of cooling plates of the present invention are stacked. In that case, the top end of the cooling plate in the stage immediately below a stage extends below the bottom end of the cooling plate in that stage. Embodiments of the present invention will be described with reference to the accompanying drawings.

The furnace wall shown in cross-section in the figure is, for example, a side furnace wall of an electric furnace. This electric furnace is, for example, a furnace for producing steel. The interior of the furnace is designated by the numeral 10. The vertical shell plate 12 of the furnace is shown. This plate is covered with a cooling device according to the invention provided on the side facing the interior 10 of the furnace.

The cooling device shown in FIGS. 1 and 2 comprises a lower cooling device with a cooling plate 14 and an upper cooling device with a cooling tube 16. Each of the cooling plates 14 of the lower cooling device has a solid plate body. The plate body is preferably made of copper or a copper alloy, in which the cooling duct 18 forms a closed cooling circuit. The plate body has the following surface area. A front surface 20 facing the interior 10 of the furnace, a rear surface 22 facing the shell plate 12 of the furnace, two lateral ends defining the plate body at its left and right, and a top defining the cooling plate at its top. It has an end 24 and a bottom end 26 defining the cooling plate at its bottom. Front 2 of cooling plate 14
0 has a well-known cooling fin 28 which increases the cooling surface facing the interior 10 of the furnace and at the same time improves the adhesion of the applied refractory material 30 to the cooling plate 14. The back surface 22 is essentially a smooth surface, the curvature of which, if necessary,
It is adapted to the curvature of the shell plate 12 of the furnace. The back 22 of the cooling plate 14
Are provided with two connecting pieces 32, which allow the flow of liquid coolant, usually cooling water, to the cooling circuit of the cooling plate 14 formed by the cooling duct 18.

The cooling tube 16 of the upper cooling device is a tube of steel or copper, fixed to a support plate 34 and embedded in a refractory material 30. The support plate 34 extends between the cooling plate 14 and the shell plate 12 of the furnace toward a base plate 36. On this base plate, the lower cooling plate 14
Are mounted at their bottom ends 26.

In accordance with an important feature of the present invention, the top end 24 of the cooling plate 14 is used exclusively for cooling water leaking from the leaking portion of the upper cooling tube 16 to the rear surface 2 of the cooling plate 14.
It is designed to deflect towards 2. As best seen in FIG. 1, the slightly wider top end 24 of the cooling plate 14 extends below its panel formed by the cooling tube 16 and over its full width "B". Cooling tube 1
6 is trapped by the top end 24 of one of these cooling plates, and then the rear surface 22 of this cooling plate 14
Deflected towards

The top end 24 of the cooling plate 14 is provided with a rib 38 that projects upwardly toward the front surface 20 of each plate. The ribs are designed to prevent liquid leaking to the top end 24 from flowing toward the front face 20 of the cooling plate 14. As a result, the collected leakage water always flows toward the back surface 22 of the cooling plate 14 and does not enter the refractory material 30 provided on the front surface 20 of the cooling plate 14, that is, the inside 10 of the furnace. On the back surface 22 of the cooling plate 14, most of the leaked water flows downward between the back surface 22 of the cooling plate 14 and the inner surface of the shell plate 12. Some of the leaking water also flows through the upper opening 40 of the shell plate 12 and then flows down the outer surface of the shell plate 12. The connecting piece 32 is projected from the opening. In either case, leaks can be detected relatively easily. It should be noted that the percentage of leaking water flowing through the upper opening 40 of the shell plate 12 will, of course, depend on the back surface 22 of the cooling plate 14, the support plate 34 and the shell plate 12.
Augmented by a suitable sealing means such as a sealing compound or a welded seam provided between the inner surfaces of the.

Similarly, as shown in FIG. 1, the bottom end 26 of the cooling plate 14 is inserted into a kind of holding recess. This holding recess is limited at its bottom by a base plate 36 and is isolated from the inside 10 of the furnace by a kind of holding barrier 42 and from the outside of the furnace, for example, by the shell plate 12 of the furnace. Water flowing down between the back surface 22 of the cooling plate 14 and the inner surface of the shell plate 12 is collected in the holding recess. The water flows out of the furnace through the lower opening 44 of the shell plate 12. Therefore, the water leaked from the leak portion is always discharged to the outside in a visible manner.

The cooling device shown in FIG. 3 differs from the cooling device of FIGS. 1 and 2. The first is that the designs of the top end portions of the cooling plates 114 and 214 are different, and the second is that the cooling plates 114 and 214 are arranged vertically in two stages. These differences are described in detail below.

The top end 124 of the lower cooling plate 114 or the top end 224 of the upper cooling plate 214 is each designed as a collection channel. Just like the cooling plate 14 of FIGS. 1 and 2, there is provided a rib 38 which projects upwardly towards the front face 20 of the cooling plate 114 so that any liquid which leaks down to the top ends 124, 224 is cooled. Prevents flow out toward the front surface 20 of the 214. further,
However, the cooling plate has ribs 1 projecting upwardly toward its rear surface 22.
27, 227, the ribs of which leak down to the top ends 124, 224 flow over the entire length of the top ends 124, 224 of the cooling plates 114, 214 and flow out toward the rear surface 22 of the cooling plate. To prevent that.

In the lower cooling plate 114, the back rib 127 extends continuously over the entire length of the top end 124. The leakage water collected in the collection channel flows out through the outlet pipe 128. This outlet pipe is sealed in bore 131 and communicates at its end with a collection channel. The outlet pipe 128 extends, for example, from the opening 40 of the shell plate 12 and reaches, for example, an external collection channel (not shown). In the upper cooling plate 214, the leaked water collected in the collecting channel flows through the groove of the rear rib 226, and flows out appropriately through the opening of the deflection plate 228 and the shell plate 12. The outlet device of the collection channel in a similar preferred embodiment is particularly inexpensive so that a hook (not shown) mounted on the back of the cooling plate to lock the cooling plate in the opening of the shell plate 12 ) Comprises an outflow duct provided integrally.

The collection channel itself has a slope towards its outlet device as appropriate. Also, at a given height at the two lateral ends of the cooling plates 114, 214, it is sealed by a lateral barrier, which prevents lateral overflow of water leaking from the collection channel. It is possible to do so. It should be noted that the rear ribs 127, 227 are set lower than the front ribs 38 so that leakage water flows to the rear (22) of the cooling plates 114, 214 even if the outlet device of the collecting channel is clogged. That is the point.

It should be noted that the cooling plates 114 and 214 in the embodiment are generally notable.
Is that the leaked water can be more positively deflected and can be deflected in a more easily detectable state. Thus, a simple liquid detector can be assigned to each outlet device, for example, that can immediately inform the furnace operator of the presence of leaking water on a particular cooling plate.

Similarly, as can be seen from FIG. 3, the bottom end 226 of the top cooling plate 214
Are complementary to the top end 124 of the lower cooling plate 114 and this end 1
24 project into the collection channel formed by. Upper cooling plate 21
The bottom end 226 of 4 forms a kind of drip rib. The drip rib is located between the ribs 38 and 127 that define the collection channel of the lower cooling plate 114. Of course, a sufficient space is left between the drip rib and the top end 124 of the lower cooling plate 114 so that the top end 124 can continue to perform its deflection function.

The cooling tube panel 16 is arranged on the second stage cooling plate 214. Of course, it is also possible to use a third cooling plate instead of these panels. It should be noted that the cooling device of FIG. 3 can, of course, also be coated on the side facing the interior of the furnace with a refractory material.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vertical furnace wall provided with a cooling device according to a first embodiment of the present invention.

FIG. 2 is a rear view of the vertical furnace wall of FIG. 1, and FIG. 1 is a sectional view taken along line 1-1 of FIG.

FIG. 3 is a sectional view of a vertical furnace wall provided with a cooling device according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Inside 12 Shell plate 14,114,214 Cooling plate 18 Cooling duct 20 Front 22 Back 24,124,224 Top end 26,226 Bottom end 38 Rib 40 Upper opening 42 Retention barrier 44 Lower opening 129,229 Outlet pipe

[Procedural Amendment] Submission of translation of Article 34 Amendment of the Patent Cooperation Treaty

[Submission date] August 24, 2000 (2000.8.24)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

The present invention relates to a cooling device for vertical walls of a general furnace, particularly an electric furnace for metal.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002] A small amount of leakage often occurs in a liquid-cooled cooling member of an electric furnace for metals such as an arc furnace and an electric reduction furnace, but such leakage cannot be easily detected.
It is usually left unnoticed for a long time. However, such small leaks carry an undue risk of safety in such furnaces. The slow but continuous penetration of spill water from the leak into the furnace refractory lining destroys the refractory lining extensively and ruptures the furnace, causing metal spills and, in some cases, severe violence. An explosion occurs. Cooling devices for spray-cooled and circulating-cooled electric furnaces are well known. A spray cooling type cooling device is disclosed in U.S. Pat. No. 5,561,685. The cooling device is composed of hollow cooling boxes, in each of which a spray device is integrated, and the spray device sprays cooling water on the inner wall of the cooling box. Therefore, when the cooling water pressure in the spray device decreases, the pressure in the cooling box substantially disappears. Conversely, in a circulating cooling type cooling device, the cooling water is pumped through the cooling channels of the cooling device. Due to the high pressure of the cooling water in the cooling channels, the risk of damage resulting from the occurrence of a leak is significantly greater than in the case of spray-cooled cooling devices.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

An object of the present invention is to reduce a safety risk caused by a leak generated in a circulating cooling type cooling device provided on a vertical furnace wall of an electric furnace for metal.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

According to the invention, this problem is solved by a cooling device according to claim 1. Such a cooling device has a lower and upper cooling device. The lower cooling device comprises at least one solid copper cooling plate with integrated channels. The cooling plate has a front surface, a rear surface, two lateral ends, a top end, a bottom end, and a surface area, similar to known cooling plates in blast furnaces. When the cooling plate is assembled, the front faces the interior of the furnace and the back faces the vertical furnace wall. According to an important feature of the invention, the top end of the cooling plate is designed to deflect liquid leaking thereon exclusively towards the rear of the cooling plate. For this purpose, the upper end of such a cooling plate has, for example, ribs projecting upwards towards the front face, the ribs flowing down to the top end and flowing out towards the front face of the cooling plate. It is designed to prevent that.
The upper cooling device comprises at least one panel formed from cooling tubes.
The panel is placed on the furnace wall above the lower cooling device and the top end of the cooling plate is set to extend below it. The solid copper cooling plate of the lower chiller ensures cooling of the furnace wall in its lower area under heavy load and cooling of the cooling tubes in the upper area under light load. Copper cooling plates have a relatively low potential for leakage. This is because, in particular, the wall thickness is large and the copper has a high resistance to degradation under the influence of heat. The top end of the cooling plate collects most of the coolant leaking from the cooling tubes,
It is deflected towards the back of the cooling plate. These top ends effectively detect small leaks in the cooling tube and prevent large amounts of liquid from such leaks from penetrating unaware to the interior of the refractory material or furnace.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

In a preferred embodiment, the top end of the cooling plate is designed as a collecting channel and has an outlet towards the rear of the cooling plate. Thus, liquid collected from the top end of the cooling plate is deflected through this outlet. This is preferably done through an opening in the shell plate of the furnace wall so that the leak is relatively easily detected and located. Further, if outlet devices protruding through the openings in the shell plate are assigned to the corresponding outlets of the collecting channel, the detection of leaks is further simplified. For example, a liquid detector could be assigned to such an outlet that immediately signals the occurrence of a leak above a particular cooling plate.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

The collection channel at the top end preferably has a slope towards the outlet. Also seal it with a barrier at both lateral ends,
It is also possible for overflow to the side to be prevented. Of course, the cooling device may be one in which the cooling plates are stacked in a plurality of stages.
In that case, the top end of the cooling plate of a stage extends below the bottom end of the cooling plate of the stage immediately above the stage.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

In such a cooling device, the bottom end of the upper cooling plate is preferably narrower than the top end of the lower cooling plate. Further, the shape of the bottom end of the upper cooling plate is preferably complementary to the shape of the top end of the lower cooling plate, such that the top end of the lower cooling plate is part of the bottom end of the upper cooling plate. It is designed to overlap. In a preferred embodiment, the bottom end of the upper cooling plate projects into a collection channel formed, for example, by the top end of the lower cooling plate. Embodiments of the present invention will be described with reference to the accompanying drawings.

[Procedural Amendment] Submission of translation of Article 34 Amendment of the Patent Cooperation Treaty

[Submission date] February 10, 2001 (2001.1.2.10)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

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Claims (19)

[Claims] 1. A cooling plate for lining an essentially vertical furnace wall, comprising a front face (20), a back face (22), two lateral ends and a top end (24).
, 124, 224) and a bottom end (26, 226), the front (20) facing the interior (10) of the furnace and the rear (22) when the cooling plate is attached.
Faces the vertical furnace wall and the top end (24, 24) of the cooling plate (14, 114, 214).
124, 224) solely dissipates the liquid leaking thereon onto the cooling plate (14, 114).
, 214), the cooling plate being designed to deflect towards the back (22). 2. A top end (24, 1) of a cooling plate (14, 114, 214).
24, 224) have ribs (38) projecting upwardly toward the front surface (20);
The rib is designed to prevent liquid that leaks to the top end (24, 124, 224) from flowing toward the front surface (20) of the cooling plate (14, 114, 214). A cooling plate according to item 1. 3. The top end (124, 224) of the cooling plate (114, 214).
) Is designed as a collection channel and the back (2) of the cooling plate (114, 214)
3. The cooling plate according to claim 1, wherein the cooling plate has an outlet toward (2). 4. The cooling plate according to claim 3, wherein the cooling channel has a slope toward the outlet. 5. The cooling plate according to claim 3, wherein the collecting channels are sealed against lateral overflow by barriers at two lateral ends of the cooling plate. 6. The cooling plate (14, 114, 214) according to claim 1, wherein the cooling plate (14, 114, 214) is a solid copper block in which at least one cooling duct (18) is arranged. Cooling plate. 7. The at least one cooling duct (18) has a top end (24, 12).
7. The cooling plate according to claim 6, wherein the cooling plate is located immediately below (4,224). 8. A bottom end (26, 2) of a cooling plate (14, 114, 214).
8. The cooling plate according to claim 1, wherein the thickness in the region of (26) is smaller than the thickness in the region of the top end (24, 124, 224). 9. The shape of the bottom end (26, 226) is such that the top end (24, 124,
The cooling plate according to claim 8, which is complementary to the shape of (224). 10. Cooling device essentially for a vertical furnace wall, at least one cooling plate (14, 114, 214) according to one of claims 1 to 9.
And an upper cooling device, wherein the upper cooling device is disposed on the furnace wall above the lower cooling device, and below the cooling plate (14, 114, 214) of the lower cooling device. The top end (24, 124, 224) has a cooling plate (14, 1) in which most of the coolant leaking from the cooling device is collected by the top end (24, 124, 224).
14, 214) a cooling device extending so as to be deflected towards the back (22). 11. The cooling device according to claim 10, wherein the upper cooling device is a cooling tube (16). 12. An upper cooling device comprising at least one upper cooling plate (214).
), The top cooling plate having in each case a front (20), a rear (22), two lateral ends, a top end (24, 124, 224) and a bottom end. (26, 226), with the back (22) facing the furnace wall and the front (20).
Faces the interior of the furnace, with the top end (124) of the cooling plate (114) of the lower cooling device just below the upper cooling plate (214) being the bottom end (226) of the upper cooling device.
The cooling device according to claim 10, wherein the cooling device extends below. 13. The bottom end (216) of the cooling plate (214) of the top cooling device.
) Project into the top end (124, 224) designed as a collecting channel of the cooling plate (114) of the lower cooling device immediately below the upper cooling device.
The cooling device according to claim 1. 14. An upper cooling device comprising a plurality of stages of cooling plates (14, 114, 214) according to one of the preceding claims, the top end of the cooling plate of the stage immediately below a stage. Part (24, 124, 224) is the bottom end (
26. The cooling device according to claim 10, wherein the cooling device extends below the first cooling device. 15. A top end (124, 224) designed as a collecting channel for the cooling plate (114, 214) is provided on the rear surface (124) of the cooling plate (114, 214).
11. An outlet opening towards 22), the outlet opening being located opposite the opening (40) of the shell plate (12) of the furnace wall.
15. The cooling device according to one of claims 14 to 14. 16. The cooling device according to claim 15, wherein an outlet device (129, 229) projecting through the opening (40) of the shell plate (12) is assigned to the outlet opening. 17. The cooling device according to claim 16, wherein the outlet device is formed by a fixed hook on the back surface (22) of the cooling plate, the fixed hook being locked in an opening in the shell plate. 18. The cooling device according to claim 16, wherein the liquid detector is assigned to the outlet device. 19. The bottom end of the cooling plate (14, 114) of the lower cooling device.
26) is inserted into the holding recess, which is isolated from the inside of the furnace (10) by the holding barrier (42) and isolated from the outside of the furnace by the shell plate (12) of the furnace, the shell plate of which holds the recess. 19. The cooling device according to claim 10, wherein the cooling device has at least one opening (44).